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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c463b878162c10ad38f58e58a0add6e3dd01e82a6062b88db276118b767762' 
  AND token = 'pOmxAF82vK0jQVP+BoPCQSX7vkXhpT+ESqIrBC5UCtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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