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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7de20374dc3fcff45fd74bf46540bf44d1d2d4f83a8ae6c96ea5bf1219ca6c' 
  AND token = 'ZZVjDw0I90EizQTHt8mk4kBpYrsaMYmwJHxj8SeNuZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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