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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd168d7e23c93ee7568f547efa541df1bbc8871b343ecc18ddbfe9c3b68da547' 
  AND token = '6xUwVUa3YkNuNodk864jm/q54pSk6PH8rl09O6z/HWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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