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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c5fbb40b13be4055e8d15f580608eeeb1967d8fbf01c4185305fcf8a23be42' 
  AND token = 'DPMFXN/5UqigTVN+A7P76SM/0ZtiByBmPivmzDNq96M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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