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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5903630c87e12835bb05040551e886773d2137e214278f6a5c6bf98446f2e1f8' 
  AND token = 'cZonSQsocA8WUevmZRlc2aBSHFNSOY++TQEzc/coyTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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