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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99db248ad1242c53b2e20c4bee2cd63be83c67f834ca3201342e7f1df5b182a' 
  AND token = 'kEmVrAzw2dDS2zfzj7EKuVKvbkc7vA0h+4BMGVFK3YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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