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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd6a7b263de5f4b249af39f37905ebe2cb1650b4b73062e02943acdda5d40f7' 
  AND token = 'C0AOH689A+93dCfLGrlg8PKR/izJh2BCzko9jpop9T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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