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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80cc9d0f57a8c753393d8e99b1406fd269be423233a8a203916d57083a5fcbed' 
  AND token = 'i0fEI9CqKB04XcP7d4ps8qaIEXIq+UAUZtExPiZ+y1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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