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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3353003ce8ce4b3c335d731531e42c2cf570a5d1a6fa31f19c3bf05c06fb84e3' 
  AND token = 'vVkPKvm/0DhhzlZSvYE3XKTQKz1kJyxj4bu5dCfJZXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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