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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75186541a33c9b093f939c3ff84e488121efcd459aefe37a4429a2149529263d' 
  AND token = 'C1NId6eSQtNAg5SVhzmyL3/iFsijR4bduLsZlr1BZcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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