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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ce3598d7029ca67cd48a8118a19382f76280df31a16190658f1618b479dd9b' 
  AND token = 'gRXuLhKBa/PGyaExA5TyewhnkduxNWZG1dTl63Tvcfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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