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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4dae12de051457e1f028b8a3dd85c7f86fd47f1ea6054d061ca9e4ba485d87' 
  AND token = 't7dcmIOf/3C1lRuI+X1Gu+NnnZM/mhKZPcg8Q8eFuVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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