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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd9730505bfd2b847fc4e940158e9563311b291b08ba253d2a3fd2ec5be6974' 
  AND token = 'Sutt76ZCbkbYp1xTO8nkFz/qe5d1oij4g7NbipyZgcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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