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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f8cbab841068b6440cb8c5316ae2b365ca18d4cb1775c68df63eb604a765b7' 
  AND token = 'yrT12bX1kjoUNJH42EpkivVpFaSKJgeH25jvdVWXu2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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