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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4210029a7143d918d9fc28afe1e474f9955ee9430c1a9700a84a573071169206' 
  AND token = '92d1tI6a3p5O9XsONi+3iWRH+sTDsIowUd1/mqFHIqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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