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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ebc7d1e06965148ce3440c11f60005be4e4b9b50e48f7aad0b8eb1d712ffb6' 
  AND token = 'CDJB+JNcoo2ViBScH3P58Q9jPHHHKobist8xZkD3rLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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