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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d8747f4230a97f45c656860d39e02be5c79cd80812285c353f10a3f2bdf1e5' 
  AND token = 'HvsiwQcMA05GNzZ6iCX9+YIm1XAhle6MXMI9EXdlMGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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