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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ced657f650d863a794fa6e7b3dc2f0e4682e370a5e9d15bbdcda6634bd541f7' 
  AND token = 're5s3As4Kpcub9hHdm12q5+ZD+TFhx5IL72e0edfB0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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