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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3079a6e26936b487f32e159d9c47dae7f93648387277fbd8b8492884a84804' 
  AND token = 'qjAMRN2rZXzZHs+L4x9931GymfNV0ITYOdX7PDo5fkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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