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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98c8aefa736d9e894eeefe6f6e945bd18b420ca22c76dca1b76db6d02df37dc' 
  AND token = 'M5h0qrc/1DdLPi5kMuz2gIt0ommz3b3VJ3mw1mU6VYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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