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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bca89d219e20270c3b2fb7c49b3e8249e7be13a936577ec89347452eb2f7d88' 
  AND token = 'SjS+YsQ4lBG08nvpj9RorTEbmprIjg7chXftpRbHMPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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