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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc56591daee2029f31acf0656c95e4e8afe310aec4d826fd3d429b540723717' 
  AND token = '0V3P867PmL8c3g+ooxOsymWdb/scTPM/PAcJVDSwpww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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