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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc7c0a15e3372404b1b70790c8e27b57139ee4d9c3b0f1ae663a6b31f2e3a54' 
  AND token = 'EPPA8jCMT1JAb/cj55suQ3BaYlTtdZ19FxGY7EtVBUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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