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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248cfccd1f3db5d8169f9033d734ebd3f3ddc112ef3ab4c6bec7ace7a1f7559f' 
  AND token = 'LyzF/mwrtyQj+YS3Y54f/DQc8nBAAtvg+58aCOVhSFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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