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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efede7a8c2ea88c452e315613c9d752a2b2fdfba19f1f1e25a38ce809b754a48' 
  AND token = 'aSXNifPZh1In6FaMvZ2gyonScU7CTBv5SaiPo0WgNiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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