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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e85e8cdc18ea1dc2e93f2a90a01ab56aac2e9301fe5e3c85fa309195eb000e' 
  AND token = 'x/9607X/zTGXwQmSZ7chOju5hoeBPIcu6yPUB5H6BAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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