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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065a6f9e450ba60e58b0c8f94cb86ce8640e08bf7c52fd28184bf5b9d9f157c8' 
  AND token = 'Kaoh8onEY4gtfuu06WKHSOy1rkNLVXMMpeDXP7ADbTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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