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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3a3f28971b91c34d18a629f74e969a763922d92d266e4cd7089a529e0c43e7' 
  AND token = 'qfftUBNni67Of7vKXLiWMSEHeT8ZZJKA+CMmcEzFBnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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