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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bf34f049613212adb3ffdaf0e0b442b9810416791af9afb47154d061894552' 
  AND token = 'DyMVvKl4JFwp8hb25QnKYvx4ArutofqhcFEPiQNqV0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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