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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838dd63d470ac837e5cb721f59fddddc8e406fdb7f9f71b314d98b4b1998d4d6' 
  AND token = 'uOJsuw5YP4QMWyMguRyAGCdvE9zSkNXMagqHp6tvKSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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