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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c7259c4417fa5eb2e1e8f63ef47f242070315a433be608d864c6471c6d3dfd' 
  AND token = 'NcAAyoSiVstvFcE4DuDCnfy5Z/YKZj4zQ/iMmOs3j/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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