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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079a3d9a2e199fa3582b449aa6d924649de70cb868973b4de154b4b9ece97f16' 
  AND token = 'iKuFtXsCdkzflZb8X+3d9N1mlio7+n46wBxlkHYcZV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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