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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f0cd402996d542157eed495d10705115b7f2c1e9a66f84791cf85273973fc2' 
  AND token = 'VOBLaIkbFkfr+2oSS+CTiJQzjpd7OIVxyOvHJRHWwf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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