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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973ea13312d1624435953d2dec4381970639721d9f74fe3839a59761def8065e' 
  AND token = 'hYBwlAWaiqvnHdUFo3rQfabJ/0aqy0KpXl6IROgD7Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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