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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992a11a13e06b762815af8e66a9ef3f77ed08f1a07be58af2f844e0d54c94f30' 
  AND token = '8MRq3jq1erGqvowdPCkgQQtZM4bg266SOUuUMurBrYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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