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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf134dabfb09d10806bb2ef87274bc317cc5037416abc3e90c93679738cdb9e' 
  AND token = '1rtd0y8bsrPG2lprtCm2w4tOgl2fn6wpivbfXpP5zIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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