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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c7a0eab7c13ad846b6442f6df60df2e54b5aa69e06e32e6a04a123018c308e' 
  AND token = 'Uk8g9A30V7n1lremM0Evtefkz2lAtbI2ChCu5Brp9XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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