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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fad13e762d8cceffe0e8daa70490ba5eefbe1edc789d0f65fe8511907d951a0' 
  AND token = 'x5M5JevSZkXcjEXXb/h8PKiPP/XkrZlmk9KL6JFuydA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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