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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b83b65c3294e5a90d4bac7968eeb20ac2612755cb01c9e7d1759530106c522' 
  AND token = 'bEQ+T4wYJfEhDVayFMl01uywmKl3jfTcYzDK3vXmbWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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