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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8a54ed6bef459f6faf85988a01d7171f377e32f5db574088ba1a01733276d3' 
  AND token = 'HQbbfrG0vqYi7WIRyum7fUkThfDKG8dHgEx+9K4D6Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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