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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4be8b89b4ada1eb17fcead971ff66b5f70dc73721ba2d09d4dd1853719a54e' 
  AND token = 'kMafJJk2X6ScZhI//ZMslHI9WgN6caLlQ26xbs0KWcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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