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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f77d4c0b9a020fb0d6e6750fa60663850722c27a692e82b6ca698b7a1efb59' 
  AND token = '43eJ7KBEv0iwrFVqyCzHgKaR4nePRsB4N+g4PwBdFHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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