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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0068adf9ce6997b755bc626c510ecbf34bd17f974e20c7ac3bbbefd08be85b28' 
  AND token = 'IzymIDF55Vi+mii1BIgHVBu+T9UY6YYpV1AWCHy4Mzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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