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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f847dc3c6d31428cfa3bdc63d2b8becb4c1769b51237158ab517bfeab135a78f' 
  AND token = 'S0rG+nvNaJWlaPJpi0Tke0GHunLR4yvBTPqEDcP65uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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