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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4a112cfeba1b622637d428794c614a0d57fd17dd6515312f45d138727abefa' 
  AND token = 'A2yZcqznDwbTknA/+Kws44RckN6yvUh+vxKrCRBnpmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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