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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fde918b4a5af999ebe2bfd2b5d8ca5a5b880c586c1c8c1a347c5b350131387' 
  AND token = '9Id1rhX98oSifqb3T7hRAvzQaXHliYA2Z40BFGmjKXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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