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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d6f1debc6cdf021114c978d6dac65b11c096ff44cbc2a627fc6b6b28119dc0' 
  AND token = 'wcRjJta0mRNeTiJw/zyiLLj0lq5qZK9tow4qNAk2ybg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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