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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f8077b14563776f209e5c1223160a27b5dcd5d1446e8ad5501c2d077533878' 
  AND token = 'pyERvAZodaLA4zccvKmTkX9AmuoFkg7jow1o/4gIL3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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