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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c859ebc99372f7dc978929b8c405b098568adaf406b60b2766b4f2e0376b1f73' 
  AND token = '5ITiac7oGkxzu2kFdAMNIKm7bUsWsP2aBjJ90UKbkpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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