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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6755f211de8560a2517182b2e7e1e81dad5b29143454010e19c47e0ee552d16a' 
  AND token = 'G930+Z0U75X03kjqBLyqLn0dnMzQhTQXEBuDf0RhYFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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