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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71402cb1a5765413d8eb571fcad5c8a410f82c404082ef36e16f8cdecc2003ba' 
  AND token = 'hZOV9HgLumLdSXvUW0Sf5Dx6xSlcs1PF+3JecyyiVjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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