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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a767272adc742bcbc892810d7d502d53e3ff8a5e3a817b75bbf6944d09ad13a1' 
  AND token = '0bbY7CZoEP9HIssVot6WZ8ZNNOW1eXzIG5kFsCjUzMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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