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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e58833b25d25fae893ae8e1dd4fd6de47ec03a1909929665551c86adc34262' 
  AND token = '+yrdUC2vyZGGqaEF+vh//1eDqdc1+Ff/AFjzTXofIzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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