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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a6cc435c79e05742c274aba7eef2f1cd1d65024267a46294bb6f52e916ac05' 
  AND token = 'mg5Ka9t+qDcKdFEu8mTh6BubesGyFUmKsD7qM741RjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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