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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4f0cf6a243b8171e53ff24cd30195cbc929268928fcfeac2d014adc8895d89' 
  AND token = 'aUP1snxYxVrNTgPKqI4Vph1IaDhr1cGm2+YFgN5rh8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}