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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b977ef111e447f813f539bf245638f0ba40013a6f13d2f5b2d4b422cb7cc07f9' 
  AND token = 'isRE88fgwr4zaP5M9P+K+ATdJfcbVvZhwDzAyf8H/co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00171

JSON explain

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