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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8de7998945065c179e98c7b8c415b7543e690bb363a98960da2e6b011100bb' 
  AND token = 'PTNDMJoYvQE19JZk3nC9FO0TUGqFAOP+i5tvBOjBYno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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