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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc9c75e2a082532a4c81c0634e34cfec8c32c57ea329cd4d0c8b5f4ad60dd5b' 
  AND token = 'PokbmnR0wn2JXH+Qfnb4q63FwOyUxfGzlJF9vl7AUzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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